In order to facilitate the application of pesticides, many farmers' friends do not separately prepare the diluent when spraying the herbicide. Instead, the herbicide is directly added to the sprayer, and the diluent is prepared in the sprayer water tank, and then directly sprayed. However, due to poor mastery of the technology for formulating herbicide diluents, problems often occur during the formulation process, directly affecting the herbicidal effect. In order to improve the control effect of herbicides, several problems must be paid attention to during the dispensing process:
There are many dosage forms of herbicide herbicides, and different dosage forms are formulated differently.
For example, emulsions, liquids and suspensions will dissolve and diffuse quickly after seeing water. The herbicides of these dosage forms can be prepared by one-step dilution method, that is, a certain amount of herbicide is directly added to the sprayer for dilution, and after dilution, it can be sprayed. Shi. This method can be used for both 72 Duer and 90 Hess creams.
Formulations such as wettable powders and dry suspoemulsions cannot be prepared by one-step dilution, but must be prepared by two-step dilution:
The first step is to accurately weigh the herbicide as required, and add a small amount of water to stir it to make it fully dissolved.
The second step is to add a certain amount of mother liquor to a certain amount of water, and then spray it evenly after dilution. 75 superstar dry suspoemulsion, 25 herbicide ether wettable powder, etc. must be diluted by this method, and must not be diluted by one-step dilution method.
To prepare the diluent, prepare the diluent in the sprayer medicine box. You must add about 10 cm of water to the medicine box before adding the medicine or mother liquid slowly to the medicine box, and then add water to the water level line to spray. Never pour the drug or mother liquor before the water tank is filled with water or fill the water tank with water, because it is difficult to prepare a uniform dilution solution, which will seriously affect the control effect.
The reason why the liquid medicine in the medicine box should be sprayed immediately is that the specific gravity of the various herbicides is not exactly the same as the specific gravity of the water. If the specific gravity of the herbicide is larger than the water, the herbicide will sink after a period of storage, resulting in the lower liquid medicine. The concentration is large, and the concentration of the upper liquid solution is small, which seriously affects the herbicidal effect.
The dilution in the sprayer is preferably added to the water level of the sprayer by adding the dilution line to the nebulizer to the water level of the sprayer. If the sprayer medicine box is filled, the liquid medicine in the medicine box is difficult to shake when the application personnel walks, and the medicine is liable to sink or float, which affects the uniformity of the liquid medicine, thereby affecting the herbicidal effect. In addition, when the pesticide application is applied, the liquid medicine is easily splashed from the mouth of the medicine box and is applied to the application personnel, so the pesticide in the medicine box must not be too full.
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